MOSSBERG 590S M-LOK - 12 GA - 3" - 20" - 7/8/13+1

Mossberg
MPN:
51602
UPC:
015813516020
$686.69 - $783.69
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The Mossberg 590S M-LOK 12 Gauge Pump-Action Shotgun redefines versatility by accepting 1¾", 2¾", and 3" shells — individually or in any mixed combination — making it one of the most adaptable defensive and tactical shotguns on the market today.

  • Cycles 1¾", 2¾", and 3" shells interchangeably in any combination
  • M-LOK forend accepts accessories like lights, grips, and rail sections
  • Dual extractors and twin action bars ensure smooth, reliable cycling
  • Anti-jam elevator prevents misfeeds during rapid or mixed-load shooting
  • Top-mounted ambidextrous safety for fast, intuitive operation left or right-handed
  • Magazine clean-out tube with cap simplifies maintenance and clearing

Who This Is For

The Mossberg 590S is built for home defenders, tactical shooters, and range enthusiasts who demand maximum flexibility from a single platform. Whether you're running light 1¾" mini-shells for reduced recoil, standard 2¾" buckshot for home defense, or 3" magnum loads for field use, this shotgun handles it all without adjustment — perfect for those who refuse to compromise on capability or reliability.

Mossberg 590S M-LOK 12 Gauge Pump Shotgun - Left Side Profile Mossberg 590S M-LOK 12 Gauge Pump Shotgun - Right Side Profile

Specifications

BrandMossberg
Model590S M-LOK
Gauge12 Gauge
Chamber3"
Barrel Length20"
Capacity7+1 / 8+1 / 13+1 (shell-length dependent)
ActionPump Action
Shell Compatibility1¾", 2¾", and 3"
ForendM-LOK Compatible
SafetyTop-Mounted Ambidextrous
ReceiverAluminum Alloy, Logo-Engraved
StockSynthetic
Overall Length~39.5"
Weight~7.25 lbs (unloaded)
Country of OriginUSA

Frequently Asked Questions

What does the 7/8/13+1 capacity rating mean on the 590S?

The capacity varies based on the shell length you load. When using full-size 3" magnum shells, the magazine holds 7 rounds plus 1 in the chamber (7+1). With standard 2¾" shells, you get 8+1. If you load compact 1¾" mini-shells, capacity jumps to an impressive 13+1. You can also mix shell lengths freely — the anti-jam elevator and dual extractors are specifically designed to handle these combinations reliably.

Can the Mossberg 590S reliably cycle all three shell lengths without modification?

Yes — that's the core engineering achievement of the 590S. Unlike standard pump shotguns that may short-stroke or misfeed with 1¾" mini-shells, the 590S is factory-designed with a modified lifter (anti-jam elevator) and dual extractors to cycle 1¾", 2¾", and 3" shells straight out of the box, individually or in mixed loads, with no parts swaps or adjustments required.

What accessories can be attached to the M-LOK forend?

The M-LOK compatible forend lets you attach a wide range of aftermarket accessories directly to the shotgun without additional adapters. Popular additions include tactical weapon lights, vertical foregrips, rail sections for optics accessories, and sling attachment points. M-LOK is an industry-standard mounting system supported by hundreds of accessory manufacturers, giving you extensive options to customize the 590S to your specific needs.

Caliber:
12 GA
Color:
Black
Barrel Length:
20"
Chamber:
3"
Sights:
Ghost Ring
Capacity:
13+1
Stock:
Fixed
Action:
Pump
Type of Barrel:
Cylinder